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(2020) Unraveling the Role of Nickel in the History of Earth and Life

Wasylenki L & Wang S

https://doi.org/10.46427/gold2020.2817

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12g: Room 4, Thursday 25th June 22:00 - 22:03

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Daniel Gr├ęgoire on Wednesday 24th June 21:13
Is Ni isotope fractionation largely driven by biological processes in modern-day environments? If so, is that what prompted the bacterial culture studies with methanogens and methanotrophs?
Thanks for a good question, Daniel. I think the talk right after me was meant to address this in part, by Seth John and his group at USC, and there is also some good work on this by Nolwenn Lemaitre/Derek Vance/Corey Archer/Emily Ciscato at ETH-Zurich. Cyanobacteria drive fractionation in the surface waters of the oceans, especially in subtropical latitudes (see Lemaitre presentation at this meeting). Less fractionation is observed in the Southern Oceans, for ecological reasons (different taxa dominate primary productivity). I think Vyl Cameron's 2009 culture experiments were motivated more by the interest in a Ni isotope paleoproxy for methanogens in the ancient rock record, because at the time she wrote that paper, nobody had yet measured Ni isotopes in seawater (Cameron and Vance published the first numbers in 2014).

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